Abstract
AbstractA novel compact microstrip dual‐mode dual‐band bandpass filter using two symmetrical twin‐inductor resonators for I‐band application is proposed.Double twin symmetrical rectangular‐shaped inductors are connected with the stepped‐impedance resonator terminals for matching 50 Ω impedance. The two twin‐inductor ends are connected to ground with via connections. The two opposite inductors are joined and become twin‐inductor structure that also behaves as an inductor‐interdigital coupling. The combination of the two those twin‐inductor interdigital structures give strong inductive couplings between the two ports and develop a fixed resonance frequency. This filter is designed to operate at 8.1 GHz and 10.7 GHz resonant frequency with a 20.98 and 13.08% effective bandwidth, respectively, at the 3‐dB passband. More than 20 dB spurious suppression was measured in between two distinct bands. The measured insertion loss (S21) was less than 1 dB recorded for both bands and return loss (S11) was more than 21 dB measured at center operating frequencies of both bands. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:638–641, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26617
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